EleutherIA — Glossary

Key Terms in the Ancient Free-Will Debate

A source-collated scholarly glossary of Greek and Latin terms for fate, necessity, voluntary action, assent, and free will, anchored to EleutherIA graph entities and published under a fail-closed review policy.

Akrasia (Weakness of Will) (ἀκρασία): Akrasia is acting contrary to one's standing rational judgment or commitment under the influence of appetite or emotion. In Plato's Protagoras 352b–358d Socrates rejects the popular picture that knowledge is overpowered and explains the error through ignorance; this is not yet a theory of a faculty called the will. Aristotle, Nicomachean Ethics VII.1–10, analyzes akrasia and at VII.7 distinguishes weakness, in which agents deliberate but do not stand by the result, from impetuosity, in which they act without waiting for deliberation. Stoic sources use a different framework, treating passions as excessive irrational impulses and, in Chrysippus, as judgments.; View in graph
Ananke (Necessity / Determinism) (ἀνάγκη): Ananke means necessity or constraint, but its role varies by author. Diogenes Laertius IX.45 reports that Democritus held that everything occurs according to necessity and called the cosmic vortex cause or necessity; talk of mechanistic laws is a modern reconstruction. In Plato's Timaeus 48a the cosmos arises from intellect and necessity, with intellect ruling by persuading necessity toward the better. Stoic fate is a separate doctrine, not a lexical development of ananke. Epicurus, Letter to Menoeceus 133–134, distinguishes necessity, chance, and what depends on us.; View in graph
Ancient Debate: Compatibilism vs. Incompatibilism: Compatibilism and incompatibilism are modern comparison categories, not names of two ancient schools. Texts attributed to Chrysippus combine universal fate with agent-relative assent, character, causal distinctions, and co-fated events, but their exact interpretation is disputed. Cicero reports Carneadean objections; Alexander polemically attacks Stoic fate; Epicurean and Christian accounts differ from one another. The ancient evidence should therefore be compared claim by claim rather than divided into two exhaustive camps.; View in graph
Modern Incompatibilist Readings of Ancient Arguments: Modern incompatibilist readings group several ancient arguments against universal fate, but no ancient school used this label. Carneades, as reported by Cicero, argues that voluntary motion need not have an external antecedent cause without being uncaused in every respect. Alexander argues that Stoic fate undermines what depends on us, yet Sharples stresses that calling the agent a starting point does not solve the causal dilemma. Lucretius and Cicero connect the Epicurean swerve with escape from necessity; no surviving text of Epicurus makes it a complete theory of free agency.; View in graph
Apocatastasis (Restoration) (ἀποκατάστασις): Apokatastasis is a general Greek word for restoration or re-establishment, whose meaning depends on context. Stoic conflagration, cosmic reconstitution, and recurrence must be distinguished and supported by their individual witnesses; Diogenes Laertius VII.134 does not by itself attest identical recurrence. “Origenist apokatastasis” is a later doctrinal label for disputed readings of eschatological passages in On First Principles. Origen's account of divine pedagogy and rational agency should not be reduced either to automatic predestination or to a simple denial of universal restoration.; View in graph
Autexousion (Self-Determination) (αὐτεξούσιον): Autexousios or autexousion denotes being under one's own authority or self-determining, with meaning that varies by context. It is not exclusively Christian: pagan authors such as Alexander of Aphrodisias use it in debates about what depends on us. Christian authors including Justin, Tatian, and Origen apply it to created rational agency, praise and blame, divine judgment, and the origin of evil, but their theories are not identical. The term does not by itself assert an uncaused or self-originating will, and any direct genealogy to Latin liberum arbitrium requires separate evidence.; View in graph
Boulesis (Rational Desire / Will) (βούλησις): Boulesis means wish or rational desire, not deliberation; deliberation is bouleusis. In Aristotle, Nicomachean Ethics III.2, boulesis differs from prohairesis: it can concern impossibilities or outcomes not achievable by the agent, and it is chiefly directed at the end. III.4 asks whether its object is the real or the apparent good. In Stoic terminology, Diogenes Laertius VII.116 defines boulesis as a well-reasoned desire, an eupathic counterpart to irrational appetite. Claims about its relation to Latin voluntas are later historical interpretations and require explicit secondary attribution.; View in graph
Clinamen / Parenklisis (Atomic Swerve) (παρέγκλισις): The atomic swerve is an Epicurean doctrine attested chiefly by Lucretius, De Rerum Natura II.216–293, and Cicero, De Fato 21–25. Lucretius describes a minimal deviation at no fixed place or time and connects it with voluntas; Cicero polemically reports that Epicurus introduced declination to avoid necessity. Epicurus's surviving Letter to Menoeceus 133–134 distinguishes necessity, chance, and what depends on us, but does not mention the swerve. The swerve should therefore not be presented as Epicurus's surviving, sufficient, or complete explanation of free action.; View in graph
Cylinder Analogy (Chrysippus): The cylinder analogy, attributed to Chrysippus by Cicero and Aulus Gellius, contrasts an initiating external push or impression with the way motion proceeds according to the cylinder's or agent's own constitution. Cicero distinguishes proximate or auxiliary causes from perfect or principal causes; Gellius uses the analogy to reject fate as an automatic excuse for wrongdoing. These witnesses do not unambiguously establish alternative possibilities or a single thesis that assent is fated but not necessary. Sources: Cicero, De Fato 39–45; Gellius, Noctes Atticae VII.2.6–13. Later interpretations should be attributed separately.; View in graph
Divine Prescience (Foreknowledge) (πρόγνωσις): Divine prescience (prognosis / praescientia) is divine knowledge of future events, including acts attributed to human choice, and raises the question whether infallible knowledge makes those events necessary. In De fato 30 Alexander argues, hypothetically, that foreknowledge can track contingent things without converting them into necessities; this need not include definite knowledge of which option an agent will choose. Origen, De oratione 6.3, argues that divine foreknowledge is not the cause of future acts arising from what is up to us; the converse-causation formula should instead be cited witness-specifically to Rufinus, Commentary on Romans VII.6.5, or to the Greek parallel at Philocalia 25.3. In Consolation V.6 Boethius treats all times as present to divine intelligence and distinguishes an event's own modality from the conditional necessity of its being known; “nunc stans” is later shorthand, not Boethius's wording there.; View in graph
Eph’ Hemin (What is In Our Power) (τὸ ἐφ’ ἡμῖν): To eph' hemin (τὸ ἐφ’ ἡμῖν, what is up to us) marks the range of actions that Aristotle connects with deliberation, voluntary action, praise, and blame. In Nicomachean Ethics III.5, 1113b6–14, he states that virtue and vice are up to us and gives a reciprocal relation between acting and not acting; 1114a–b then connects responsibility for character with earlier voluntary conduct. This does not by itself establish causally undetermined alternatives. Bobzien analyses Aristotle's usage as two-sided at a generic level while stressing that it entails neither determinism nor indeterminism, and contrasts it with a one-sided causative reconstruction of Stoic usage.; View in graph
Exercitatio (Adversity as Training) (exercitatio): Exercitatio designates Seneca's argument in De providentia 2–5 that apparent adversity can train, test, and display the virtue of a good person rather than constitute a genuine moral evil. Seneca develops the point through athletic competition, paternal discipline, military service, and the distinction between what one undergoes and how one bears it. Two often-cited maxims belong at De providentia 2.3–4 and 5.9–10, though paragraph divisions vary by edition.; View in graph
Fortuna (Fortune) (fortuna): In Book II of Boethius's Consolation, Fortuna personifies worldly instability and reversals of prosperity and adversity; she is not identical with the technical account of chance (casus) in V.1. Her wheel represents the rise and fall of external conditions, and riches, honours, and power are revocable loans rather than secure possessions. Philosophy argues that mutable externals cannot constitute beatitudo, while III.10 identifies perfect happiness and the highest Good with God.; View in graph
Hegemonikon (Ruling Faculty) (ἡγεμονικόν): The hegemonikon is the Stoic commanding faculty, the chief part of the soul in which impressions, assent, sensation, impulses, and reasoning are coordinated. In human beings it is rational and therefore central to responsible agency, but Stoic accounts also assign a hegemonikon to non-rational animals. Marcus Aurelius VIII.48 says that the ruling faculty can gather into itself and compares a mind free from passions to a citadel; IV.3 separately recommends retreat into one's own soul. “Inner citadel” is Hadot's modern synthesis, while Marcus's explicit restriction of desire and aversion to what is up to us is better anchored at VIII.7.; View in graph
Heimarmene (Stoic Fate) (εἱμαρμένη): Heimarmene (fate) names the Stoic order that links events in an everlasting causal sequence governed by divine reason. Chrysippus's definition as a natural and inviolable ordering of the whole is transmitted by Aulus Gellius, Noctes Atticae 7.2.3 (= SVF II.1000), not SVF II.916. Stoic attempts to preserve responsibility are transmitted through different arguments: Cicero distinguishes causal roles, Gellius appeals to the agent's constitution, and Cicero also reports co-fated outcomes. Whether these materials amount to a successful or unified compatibilism remains disputed.; View in graph
Hekousion (Voluntary) (ἑκούσιον): Hekousion (ἑκούσιον, voluntary) is Aristotle’s concept for actions that originate in the agent with knowledge of the particular circumstances. Defined in Nicomachean Ethics III.1, a voluntary action is one whose origin (ἀρχή) is in the agent, who is aware of the circumstances — establishing two conditions: internal causal origin (not external force) and knowledge (not ignorance). Voluntary actions are the proper objects of praise and blame. The voluntary is broader than deliberate choice (προαίρεσις): children and animals act voluntarily but do not deliberate.; View in graph
Libertas Indifferentiae (Liberty of Indifference) (libertas indifferentiae): Liberty of indifference is a family of later scholastic and early modern views on a will that is not necessitated to one alternative; it should not be defined uniformly as choice without reasons. Medieval accounts of synchronic contingency may be treated as antecedents only with explicit attribution. In the Fourth Meditation (AT VII 57–58), Descartes calls reasonless indifference the lowest grade of freedom, while his later correspondence with Mesland distinguishes this negative state from a positive two-way power of the will. Descartes therefore cannot be cited as endorsing indifference as the highest degree of freedom.; View in graph
Libertas Spontaneitatis (Liberty of Spontaneity) (libertas spontaneitatis): Liberty of spontaneity is the school distinction, explicitly reported by Hume in Treatise 2.3.2.1, for freedom to act according to one's will without external violence or obstruction; it contrasts with liberty of indifference understood there as absence of necessity and causes. This form of freedom can be compatible with causal determination, but different early modern authors add different conditions. Aristotle's hekousion and Stoic accounts of assent are useful structural comparisons, not attestations of the Latin term or proof of a direct historical adaptation.; View in graph
Liberum Arbitrium (Free Choice) (liberum arbitrium): Liberum arbitrium is a Latin family of expressions for free judgment or choice whose meaning changes across authors. Tertullian uses the language of arbitrii libertas and liberi arbitrii in Adversus Marcionem II.5–7; his explicit gloss of Greek autexousion as libera arbitrii potestas occurs instead at De anima 21.6. Rufinus frequently uses liberum arbitrium when translating Origen, but each equivalence must remain witness-specific rather than being treated as a single lexical event. Augustine gives the phrase a major role in responsibility and grace; in his anti-Pelagian works free choice remains imputable, while salvific willing and action require healing and liberating grace.; View in graph
Principle of Alternate Possibilities (PAP): The Principle of Alternate Possibilities says that moral responsibility for an action requires the ability to have done otherwise. Frankfurt's 1969 article names and states this already influential principle in order to reject it, using cases in which an inactive counterfactual intervener would have ensured the same result. Van Inwagen's Consequence Argument supports incompatibilism between determinism and free will, not PAP; in An Essay on Free Will chapter V he accepts Frankfurt-style counterexamples to PAP and develops different principles connecting responsibility with freedom. Fischer and Ravizza later defend semicompatibilism through reasons-responsive guidance control, which does not require access to alternatives.; View in graph
Prohairesis (Deliberate Choice) (προαίρεσις): Prohairesis is Aristotle's term for deliberate choice or decision. Nicomachean Ethics III.2 distinguishes it from the broader voluntary: children and non-rational animals act voluntarily but do not exercise prohairesis. At III.3, 1113a10–11, Aristotle characterizes choice as deliberative desire concerning things up to us; deliberation concerns the things that contribute toward an end, not the end itself. Prohairesis therefore joins desire and deliberative reasoning and is especially revealing of character, without being a separately named faculty.; View in graph
Providentia (Stoic Providence) (providentia): In Seneca's De providentia, providentia is the rational divine governance invoked to explain why apparent adversities befall good people. Seneca compares divine care to a demanding father's training, argues that external hardships do not constitute moral evil for a good person, and reserves genuine evil for vice. In 5.7–8 he also describes fate as an ordered chain of causes binding human and divine events. Treating providence as the plan and fate as its execution is a useful modern Stoic synthesis, not Seneca's explicit definition in this treatise.; View in graph
Summum Bonum (Supreme Good) (summum bonum): In Boethius's Consolation III, the supreme Good is the unified and self-sufficient good sought through every partial good, and perfect happiness is participation in or attainment of that Good. Wealth, honour, power, fame, and pleasure fail when treated separately because none supplies the complete state that lacks nothing. In III.10 Boethius identifies perfect happiness and the highest Good with God. The argument belongs to a late antique Platonist context, but a specific derivation from Plotinus's One and a descent-return scheme requires separate evidence.; View in graph
Synkatathesis (Stoic Assent) (συγκατάθεσις): Synkatathesis is the Stoic act of assenting to an impression and is central to Stoic accounts of rational action. Cicero, De fato 39–43, distinguishes the external antecedent condition from a complete or principal causal role and places assent in our power; Aulus Gellius 7.2.6–13 separately transmits the cylinder analogy and appeals to the agent's constitution. These sources help explain how fated impressions and agent-dependent assent were distinguished, but the modal and moral success of the resulting modern “compatibilist” reconstruction remains disputed.; View in graph
To Endechomenon (The Contingent) (τὸ ἐνδεχόμενον): Aristotle uses endechomenon and related modal vocabulary in context-dependent ways for what can be or can be otherwise. In De interpretatione 9 he rejects the inference from statements about singular future events to the necessity of those events, but the exact status he gives their present truth values is disputed. Diodorus Cronus's Master Argument supports his restrictive account of possibility; this should not be generalized to every Dialectician or Megarian. Chrysippean modality does not reduce contingency to ignorance, since its categories can treat some fated events as possible and non-necessary. Alexander later defends two-way contingency against determinism, while the Epicurean swerve belongs to a separate and disputed physical argument.; View in graph
Tyche (Chance) in Alexander (τύχη): In De fato VIII (Bruns 172.17–174.28), Alexander describes luck and the fortuitous as unexpected outcomes that supervene on actions directed toward other ends. Digging may accidentally result in finding treasure, and going to the marketplace for another purpose may result in collecting a debt. The prior action is a clear causal condition of the result but not its proper or primary cause; Alexander therefore contrasts per se and per accidens causation rather than making chance wholly uncaused. Such outcomes occur rarely relative to the regular results of prior activities, in an account indebted to Aristotle, Physics II.4–6.; View in graph
Voluntas (Will) (voluntas): Voluntas is a Latin term whose meanings range across wish, intention, consent, and willing. In Tusculan Disputations IV.12 Cicero proposes voluntas as the Latin rendering of the Stoic boulēsis in that specific taxonomy: a rational aspiration attributed to the sage. Seneca gives voluntas important moral uses, but whether these amount to a distinct faculty should remain a scholarly interpretation. Augustine makes voluntas and liberum arbitrium central to responsibility, sin, and grace; whether this is an invention of “the will” or a transformation of Greek and Stoic materials is the disputed question addressed differently by Dihle and Frede.; View in graph